Last week, Lamar Odom's best friend Jamie Sangouthai died from a bacterial infection after using intravenous drugs.

Yesterday, we learned that 30-year-old Bobby Heyward died from what is believed to be a drug overdose. Heyward was such close friends with Odom and Sangouthai that his final Instagram posts were photos of the three of them together.

Kylie and Kendall paid tribute to Caitlyn by posting heartwarming Father's Day messages to Instagram yesterday, but just moments ago, we got our first glimpse at how the former Olympian's kids really marked the occasion: